摘要
选用华星集团炼油厂（华星）、中国石化茂名分公司（茂名）、中国石化济南分公司（济南）炼油厂的FCC新鲜剂为研究对象，在791～800℃区间内，以3℃的温度跨度，考察老化温度对FCC催化剂的物性及裂化性能的影响。采用xRD、BET表征手段及ACE催化裂化评价装置对催化剂物性及裂化活性进行考察。结果表明，华星791℃老化剂中分子筛的结构仍保持良好，随老化温度升高其结晶度呈显著下降趋势，华星797℃老化剂的物性及裂化活性最接近其平衡剂，但ACE评价结果的积炭、干气、液化气收率明显低于平衡剂，汽油收率显著高于平衡剂。此外，不同厂家800℃老化剂中分子筛的结晶度同其平衡剂相比呈现明显的差异。在791～800℃区间内，温度细小变化可致催化剂结构及其裂化活性迥异，需根据不同厂家催化剂的特性适当于800℃上下浮动并精确控制老化温度，以达到同其平衡剂相当的催化裂化活性。
The FCC catalysts from refineries of Huaxing Group, SINOPEC Maoming Company, Jinan Company were pretreated in 100% steam at the range of 791--800 ℃ in every 3 ℃ interval for 17 h. The physic-chemical features of aged catalysts were characterized by XRD, N2-adsorption. The cata lytic cracking performance of the samples was investigated on MAT and fixed fluidized bed reactor （ACE-MODEL R＋ MM）. The results show that the structure of molecular sieve in the Huaxing catalyst aged at 791 ℃ is kept well and very similar to that of its fresh catalyst, and the crystallinity of molecular sieve is decreased significantly with increasing the aging temperature. The physic-chemical properties and cracking conversion of Huaxing catalyst aged at 797 ℃ is equivalent to its equilibrium catalyst. However, the ACE results indicate that yields of carbon deposition, dry gas and LPG are significantly lower than that of its balance agent, and yield of gasoline is opposite. The significant differences in crys- tallinity compared with equilibrium catalysts exist between the catalysts steam aged at 800 ℃from dif- ferent company. The results show that a relative small change of aged temperature in the range of 791 800 ℃can significantly influence on the structure and catalytic cracking activity of aged catalysts. In or der to reach the activity the same as the equilibrium catalyst, careful selection and control of the aging temperature based on the properties of fresh catalyst and its application are necessary.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2013年第11期15-18,共4页
Petroleum Processing and Petrochemicals
基金
国家科技支撑计划(2012BAE05B02)资助项目
关键词
老化温度
催化裂化
催化剂
水热老化
平衡剂
aging temperature FCC catalyst hydrothermal aging equilibrium catalyst
